Cm2250 injector advice

[JimT]

I don't know what's transpired here and I don't want to get involved.

But as to your original question the consensus on this forum is that you should always go with OEM injectors. The requirements and tolerances are such that aftermarket ones just can't perform the same. As for the trim code, that is basically a set of information that the ECM uses to properly control that individual injector. It identifies how that injector performs so the ECM knows how to operate it get the desired results. Don't even think about replacing an injector without updating the trim code in the ECM. Which is why you need Insite, among the many other things it can do. Further, before you determine that an injector needs to be replaced there are tests and troubleshooting that should be done. Insite is needed as well as the troubleshooting steps provided with Insite or on Quickserve.

For more detailed information, including some recent discussion, use the search box(es) on here and read up.